VR4 or other

I watched a video of  an officail test race with VR4, rx7, supra, skyline, 300zx TT, and a predlude.  The race was in Japan, when all these cars first came out.  These cars were all stock. Well anyway the VR4 won the whole thing.  But can the VR4 be the fastest after all the atermarket parts you want are added?  Will it still win.  Because everyone i know just says my VR4 is too heavy and no matter what a supra or RX7 will kill me.  I've beaten an rx7 street ported before but idunno about all the others.. What do you guys think????

There are staged kits that can take the VR-4 up to 900HP.  I don't think any of the others can beat it.  Check out the video on the car built by 3SX on their website. 
 
http://www.3sx.com/store/comersus_index.asp